Bump actions/checkout from 3.6.0 to 4.0.0 #561

	# This workflow will build a Java project with Gradle
	# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-gradle

	name: JDK 11

	on:
	push:
	branches: [ 3.x ]
	pull_request:
	branches: [ 3.x ]

	permissions:
	contents: read

	jobs:
	build:

	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4.0.0
	- name: Set up JDK 11
	uses: actions/setup-java@cd89f46ac9d01407894225f350157564c9c7cee2 # v3.12.0
	with:
	distribution: 'zulu'
	java-version: '11'
	- name: Cache Gradle packages
	uses: actions/cache@88522ab9f39a2ea568f7027eddc7d8d8bc9d59c8 # v3.3.1
	with:
	path: ~/.gradle/caches
	key: ${{ runner.os }}-gradle-1-${{ hashFiles('*/.gradle') }}
	restore-keys: ${{ runner.os }}-gradle-1-
	- name: Grant execute permission for gradlew
	run: chmod +x gradlew
	- name: Verify generated module-info
	run: ./gradlew -PjavaCompatibility=9 jar
	- name: Build RxJava
	run: ./gradlew build --stacktrace
	- name: Generate Javadoc
	run: ./gradlew javadoc --stacktrace

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